Convert a hexadecimal value into a binary value

Question

I have a program that needs to take a hexadecimal value of 2 digits (up to FF) and convert each digit into a separate 4-digit binary value (up to 1111). I'm able to write an algorithm that would do this for me, but before I do that, is there an easy way to do this with built-in functions in C++?

Are doing this with string representations of hexadecimal characters? What is the type of `FF` — asimes, Nov 05 '16 at 18:15
You can perhaps check if the below answers your question. http://stackoverflow.com/questions/18310952/convert-strings-between-hex-format-and-binary-format — Soundararajan, Nov 05 '16 at 18:15

Shravan40 · Answer 1 · 2016-11-05T18:28:38.770

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Write a mapping between the hex charachters an their binary.

std::string HexCharToBinary( char c ) {
switch (c) {
  case '0': return "0000";
  case '1': return "0001";
  // Now input rest of the cases.
  case 'f': return "1111";
  default: assert(false); return "bad input";
};

As pointed out @Crazy Eddie in comment section.

Using an array would much better and optimal solution.

edited Nov 05 '16 at 18:28

answered Nov 05 '16 at 18:16

Shravan40

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Can you please link this (http://stackoverflow.com/questions/483609/how-can-i-convert-hexadecimal-numbers-to-binary-in-c) instead, to avoid duplication. – Soundararajan Nov 05 '16 at 18:17
Why oh why didn't you just use an array??? – Edward Strange Nov 05 '16 at 18:26
If an answer to another question answers this, mark the question as duplicate rather than copy the answer. Definitely don't copy without attribution. – interjay Nov 05 '16 at 18:27
@CrazyEddie : My bad. I didn't thought about it. – Shravan40 Nov 05 '16 at 18:28

score 0 · Answer 2 · edited May 23 '17 at 12:33

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There's a similar question that was already answered here:

Convert strings between hex format and binary format

You might want to check it out, I think the answer provided there is complete and easy to understand.

edited May 23 '17 at 12:33

Community

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answered Nov 05 '16 at 18:18

cookie_monster

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Convert a hexadecimal value into a binary value

2 Answers2